full of blue mud

You don't know what you're talking about. Or you do, and are just trying to pull a fast one on someone.

Global warming? What global warming? Those silly environmentalists; they're always full of blue mud!

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sucks blue mud

A way to clarify how bad somebody is at something. Really bad. I mean really, really bad. So bad, that well frankly, you suck blue mud.

Shaq sucks blue mud when he shoots free throws.

Bush sucks blue mud as president.

Hey bitch...you suck blue mud (at giving blow jobs) !!!!

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blue mud

Ugly. Not attractive.

She is. Blue mud.